Table 1.

Typical corrosion rates from LPR measurements [19]

Corrosion classification	Corrosion current density i corr (μA/cm2)	Corrosion penetration ratea (μm/year)
Passive/very low	Up to 0.2	Up to 2
Low/mod	0.2 to 0.5	2 to 6
Mod/high	0.5 to 1.0	6 to 12
Very high	>1.0	>12

^aLoss of reinforcement section from Faraday’s Law, assuming Fe → Fe